US7446533B2 - RF shielding method, MRI apparatus, and transmitting/receiving surface coil - Google Patents
RF shielding method, MRI apparatus, and transmitting/receiving surface coil Download PDFInfo
- Publication number
- US7446533B2 US7446533B2 US11/548,302 US54830206A US7446533B2 US 7446533 B2 US7446533 B2 US 7446533B2 US 54830206 A US54830206 A US 54830206A US 7446533 B2 US7446533 B2 US 7446533B2
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- United States
- Prior art keywords
- coil
- surface coil
- shield
- mri apparatus
- transmitting
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- Expired - Fee Related
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/42—Screening
- G01R33/422—Screening of the radio frequency field
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/341—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3642—Mutual coupling or decoupling of multiple coils, e.g. decoupling of a receive coil from a transmission coil, or intentional coupling of RF coils, e.g. for RF magnetic field amplification
- G01R33/3657—Decoupling of multiple RF coils wherein the multiple RF coils do not have the same function in MR, e.g. decoupling of a transmission coil from a receive coil
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
Definitions
- the present invention relates to an RF shielding method, an MRI (Magnetic Resonance Imaging) apparatus, and a transmitting/receiving surface coil. More particularly, the present invention is concerned with an RF shielding method, an MRI apparatus, and a transmitting/receiving surface coil, which can reduce the cost for isolation of a body coil installed on a magnet assembly side, from a surface coil.
- Patent Literatures 1 and 2 there has been known a technique wherein an RF shield is provided between a body coil installed on a magnet assembly side and a gradient magnetic field coil (see, for example, Patent Literatures 1 and 2).
- Patent Literature 1 Japanese Unexamined Patent Publication No. 2000-11619
- Patent Literature 2 Japanese Unexamined Patent Publication No. 2004-248928
- isolation of a gradient magnetic field coil against RF pulses transmitted from a body coil installed on a magnet assembly side has been performed through an RF shield, but isolation of a body coil installed on a magnet assembly side against RF pulses transmitted from a surface coil has been performed using a switch provided on the body coil side to switch ON/OFF condition of a diode from one to the other through a bias power supply and thereby turn ON or OFF the body coil.
- the bias power supply is of a large current or large voltage specification and a high performance filter for the prevention of noise propagation is required, thus resulting in an increase of the apparatus scale and of cost.
- a component resistant to high current and high voltage such as a diode for a large current, thus also giving rise to the problem that the cost becomes high.
- an RF shielding method comprising providing an RF shield between a body coil installed on a magnet assembly side of an MRI apparatus and a surface coil not installed on the magnet assembly side, to suppress reception by the body coil of RF pulses transmitted from the surface coil.
- the RF shielding method in the above one aspect of the present invention since the reception by the body coil of RF pulses transmitted from the surface coil is suppressed by the RF shield disposed between the two, an induced voltage in the body coil drops to a great extent. Consequently, the switch provided on the body coil side can dispense with a component resistant to high voltage and high current such as a diode for a large current, whereby it is possible to reduce the cost. Moreover, it becomes unnecessary to use a bias power supply of a large current or large voltage specification and the use of a high performance filter also becomes unnecessary. Thus, not only the apparatus can be simplified but also the cost can be reduced. As a result, the reliability of the apparatus is improved.
- an MRI apparatus comprising: a body coil installed on a magnet assembly side; a surface coil not installed on the magnet assembly side; and an RF shield provided between the body coil and the surface coil to suppress reception by the body coil of RF pulses transmitted from the surface coil.
- the switch provided on the body coil side no longer requires a component resistant to high voltage and current such as a diode for a large current, whereby it is possible to reduce the cost.
- a third aspect of the present invention there is provided, in combination with the above second aspect, an MRI apparatus wherein the RF shield is integral with the surface coil.
- the RF shield is integral with the surface coil, handling of the apparatus becomes convenient.
- a fourth aspect of the present invention there is provided, in combination with the above fourth aspect, an MRI apparatus wherein the RF shield is separate from the magnet assembly and the surface coil.
- the body coil installed on the magnet assembly side can be used as a transmitting coil, while the surface coil can be used as a receiving coil.
- an MRI apparatus wherein the RF shield is installed on the magnet assembly side so that it can be inserted in and removed from between the body coil and the surface coil.
- the RF shield is installed on the magnet assembly side, handling of the apparatus is convenient. Besides, by removing the RF shield, the body coil installed on the magnet assembly side can be used as a transmitting coil.
- a transmitting/receiving surface coil comprising: a surface coil body used in the vicinity of a subject and having a transmitting and receiving function; and an RF shield integral with the surface coil body on the side opposite to the subject.
- the transmitting/receiving surface coil in the above sixth aspect since the reception by the body coil of RF pulses transmitted from the transmitting/receiving surface coil is suppressed by the RF shield, an induced voltage in the body coil drops to a great extent. Consequently, the switch provided on the body coil side no longer requires a component resistant to high voltage and high current such as a diode for a large current, whereby the cost can be reduced. Moreover, a bias power supply of a large current or voltage specification is no longer required, nor is required the use of a high performance filter. Consequently, not only the apparatus can be simplified but also the cost can be reduced. Eventually, the apparatus reliability is improved.
- a transmitting/receiving surface coil wherein the surface coil body is cylindrical and the RF shield is in a cylindrical shape which surrounds the outer periphery of the surface coil body.
- the reception by the body coil of RF pulses transmitted from the cylindrical surface coil body can be suppressed suitably by the cylindrical RF shield.
- a transmitting/receiving surface coil wherein the surface coil body is in the shape of a plate and the RF shield is in the shape of a plate integral with one surface side of the surface coil body.
- the reception by the body coil of RF pulses transmitted from the plate-like surface coil body can be suppressed suitably by the plate-like RF shield.
- the RF shielding method, MRI apparatus and transmitting/receiving surface coil of the present invention it is possible to reduce the cost for isolation between the surface coil and the body coil installed on the magnet assembly side. Further, the reliability can be improved.
- the RF shielding method, MRI apparatus and transmitting/receiving surface coil according to the present invention can be utilized in MR imaging which uses a surface coil.
- FIG. 1 is a perspective view showing an MRI apparatus and a transmitting/receiving surface coil according to a first embodiment of the present invention
- FIG. 2 is a perspective view showing the transmitting/receiving surface coil according to the first embodiment
- FIG. 3 is a perspective view showing a transmitting/receiving surface coil according to a second embodiment of the present invention.
- FIG. 4 is a perspective view showing an MRI apparatus and a transmitting/receiving surface coil according to a third embodiment of the present invention
- FIG. 5 is a perspective view showing the transmitting/receiving surface coil according to the third embodiment
- FIG. 6 is a perspective view showing a transmitting/receiving surface coil according to a fourth embodiment of the present invention.
- FIG. 7 is a perspective view showing an MRI apparatus (with RF shield inserted) according to a fifth embodiment of the present invention.
- FIG. 8 is a perspective view showing the MRI apparatus (with RF shield removed) according to the fifth embodiment.
- FIG. 1 is a perspective view showing an MRI apparatus 100 and a transmitting/receiving surface coil 10 according to a first embodiment of the present invention.
- a body coil 2 In the MRI apparatus 100 , a body coil 2 , an RF shield 3 for the body coil, and a gradient magnetic field coil 4 , are disposed in the interior of a magnet assembly 1 concentrically and in this order from the inner periphery side.
- a main magnetic field generating magnet 5 is disposed outside the gradient magnetic field coil 4 .
- a bore (a cylindrical space) S for insertion therein of a subject H placed on a cradle of a table unit T is formed in the magnet assembly 1 .
- the transmitting/receiving surface coil 10 which is cylindrical, is mounted to the subject H.
- the transmitting/receiving surface coil 10 is made up of a cylindrical surface coil body 11 and a cylindrical RF shield 12 for the surface coil which shield 12 surrounds the outer periphery of the surface coil body 11 .
- the surface coil body 11 and the RF shield 12 for the surface coil are integral with each other.
- the MRI apparatus 100 and the transmitting/receiving surface coil 10 of this first embodiment since the reception by the body coil 2 of RF pulses transmitted from the surface coil body 11 is suppressed by the RF shield 12 for the surface coil, an induced voltage in the body coil 2 drops to a great extent. Therefore, in a switch (not shown) provided on the body coil 2 side, it is no longer required to use a component resistant to high voltage and high current such as a diode for a large current and it is possible to attain the reduction of cost. Likewise, the use of a bias power supply of a large current or large voltage specification becomes unnecessary and so does the use of a high performance filter. Consequently, not only the apparatus can be simplified but also the cost can be reduced. As a result, it is possible to improve the reliability of the apparatus.
- a surface coil body 11 and an RF shield 12 for a surface coil in a transmitting/receiving surface coil 10 may be made separate from each other.
- the transmitting/receiving surface coil 10 of this second embodiment by applying the RF shield 12 for the surface coil over the outer periphery of the surface coil body 11 , the reception by the body coil 2 of RF pulses transmitted from the surface coil body 11 can be suppressed.
- the body coil 2 can be used as a transmitting coil.
- a plate-like transmitting/receiving surface coil 10 As shown in FIG. 4 , there may be used a plate-like transmitting/receiving surface coil 10 .
- This transmitting/receiving surface coil 10 is made up of a plate-like surface coil body 11 and a plate-like RF shield 12 for the surface coil which shield is disposed on the side opposite to the subject with respect to the surface coil body 11 .
- the surface coil body 11 and the RF shield 12 for the surface coil in the transmitting/receiving surface coil 10 are integral with each other.
- a surface coil body 11 and an RF shield 12 for the surface coil in a transmitting/receiving surface coil 10 may be separate from each other.
- FIG. 7 is a perspective view of an MRI apparatus 200 according to a fifth embodiment of the present invention.
- an RF shield 22 for a surface coil, a body coil 2 , an RF shield 3 for the body coil, and a gradient magnetic field coil 4 are disposed in the interior of a magnet assembly 1 concentrically and in this order from the inner periphery side.
- a main magnetic field generating magnet 5 is disposed outside the gradient magnetic field coil 4 .
- a bore (a cylindrical space) S for insertion therein of a subject H placed on a cradle of a table unit T is formed in the magnet assembly 1 .
- a cylindrical surface coil 21 is mounted to the subject H.
- the MRI apparatus 200 of this fifth embodiment since the reception by the body coil 2 of RF pulses transmitted from the surface coil 21 is suppressed by the RF shield 22 for the surface coil, an induced voltage in the body coil 2 drops to a great extent. Consequently, a switch (not shown) disposed on the body coil 2 side can dispense with a component resistant to high voltage and high current such as a diode for a large current and it is possible to reduce the cost. Besides, the use of a bias power supply of a large current or large voltage specification becomes unnecessary and so does the use of a high performance filter. Thus, not only the apparatus can be simplified but also the cost can be reduced. As a result, it is possible to improve the reliability of the apparatus.
- the RF shield 22 for the surface coil can be drawn out from the bore S manually or automatically.
- the body coil 2 With the RF shield 22 for the surface coil drawn out from the bore S, the body coil 2 can be used as a transmitting coil.
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Epidemiology (AREA)
- High Energy & Nuclear Physics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Pathology (AREA)
- Molecular Biology (AREA)
- Radiology & Medical Imaging (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-298288 | 2005-10-13 | ||
JP2005298288A JP4664797B2 (ja) | 2005-10-13 | 2005-10-13 | Mri装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20070132453A1 US20070132453A1 (en) | 2007-06-14 |
US7446533B2 true US7446533B2 (en) | 2008-11-04 |
Family
ID=37896655
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/548,302 Expired - Fee Related US7446533B2 (en) | 2005-10-13 | 2006-10-11 | RF shielding method, MRI apparatus, and transmitting/receiving surface coil |
Country Status (5)
Country | Link |
---|---|
US (1) | US7446533B2 (de) |
JP (1) | JP4664797B2 (de) |
KR (1) | KR101260074B1 (de) |
CN (1) | CN1947656B (de) |
DE (1) | DE102006049066A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10444307B2 (en) | 2014-11-25 | 2019-10-15 | Samsung Electronics Co., Ltd. | Surface coil for magnetic resonance imaging system and magnetic resonance imaging system including same |
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TWI581269B (zh) * | 2008-09-30 | 2017-05-01 | Lsi公司 | 利用解碼器效能回饋用於記憶體裝置之軟性資料產生的設備及方法 |
US8266503B2 (en) | 2009-03-13 | 2012-09-11 | Fusion-Io | Apparatus, system, and method for using multi-level cell storage in a single-level cell mode |
US8261158B2 (en) * | 2009-03-13 | 2012-09-04 | Fusion-Io, Inc. | Apparatus, system, and method for using multi-level cell solid-state storage as single level cell solid-state storage |
US8854882B2 (en) | 2010-01-27 | 2014-10-07 | Intelligent Intellectual Property Holdings 2 Llc | Configuring storage cells |
US8661184B2 (en) | 2010-01-27 | 2014-02-25 | Fusion-Io, Inc. | Managing non-volatile media |
US8315092B2 (en) * | 2010-01-27 | 2012-11-20 | Fusion-Io, Inc. | Apparatus, system, and method for determining a read voltage threshold for solid-state storage media |
US8380915B2 (en) | 2010-01-27 | 2013-02-19 | Fusion-Io, Inc. | Apparatus, system, and method for managing solid-state storage media |
US9245653B2 (en) | 2010-03-15 | 2016-01-26 | Intelligent Intellectual Property Holdings 2 Llc | Reduced level cell mode for non-volatile memory |
US9292377B2 (en) | 2011-01-04 | 2016-03-22 | Seagate Technology Llc | Detection and decoding in flash memories using correlation of neighboring bits and probability based reliability values |
US8804415B2 (en) | 2012-06-19 | 2014-08-12 | Fusion-Io, Inc. | Adaptive voltage range management in non-volatile memory |
TW201500251A (zh) * | 2013-06-21 | 2015-01-01 | Hon Hai Prec Ind Co Ltd | 汽車方向盤及採用汽車方向盤之汽車 |
KR101669519B1 (ko) | 2014-02-28 | 2016-10-26 | 동아대학교 산학협력단 | Orc 발전 시스템용 터빈 |
DE102014206522A1 (de) * | 2014-04-04 | 2015-10-08 | Sirona Dental Systems Gmbh | MRT-Aufnahmevorrichtung |
KR101635641B1 (ko) | 2014-04-22 | 2016-07-20 | 한국표준과학연구원 | 자기공명 의료영상 획득을 위한 마이크로스트립 기반의 알에프 표면 리시브 코일 및 이를 구비한 rf 공진기 |
JP6212442B2 (ja) * | 2014-06-30 | 2017-10-11 | ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー | 磁気共鳴信号処理方法、磁気共鳴信号処理装置及び磁気共鳴装置並びにプログラム |
US20170003367A1 (en) * | 2015-06-30 | 2017-01-05 | General Electric Company | Magnetic resonance imaging system and method |
US11029378B2 (en) * | 2016-12-14 | 2021-06-08 | Aspect Imaging Ltd. | Extendable radiofrequency shield for magnetic resonance imaging device |
CN113109748A (zh) * | 2021-05-08 | 2021-07-13 | 苏州众志医疗科技有限公司 | 用于磁共振成像的射频装置和磁共振成像系统 |
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2005
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- 2006-10-12 KR KR1020060099303A patent/KR101260074B1/ko not_active IP Right Cessation
- 2006-10-13 CN CN200610160505XA patent/CN1947656B/zh not_active Expired - Fee Related
- 2006-10-13 DE DE102006049066A patent/DE102006049066A1/de not_active Withdrawn
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US10444307B2 (en) | 2014-11-25 | 2019-10-15 | Samsung Electronics Co., Ltd. | Surface coil for magnetic resonance imaging system and magnetic resonance imaging system including same |
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KR20070041351A (ko) | 2007-04-18 |
CN1947656B (zh) | 2011-11-16 |
KR101260074B1 (ko) | 2013-05-02 |
JP4664797B2 (ja) | 2011-04-06 |
US20070132453A1 (en) | 2007-06-14 |
JP2007105192A (ja) | 2007-04-26 |
DE102006049066A1 (de) | 2007-04-19 |
CN1947656A (zh) | 2007-04-18 |
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